Assess learners' ability to analyze and compare life-cycle greenhouse gas emissions of concrete, steel, and timber in building applications. Items will test knowledge of LCA stages and boundaries (extraction, manufacturing, transport, construction, use, end-of-life), key emission drivers (embodied carbon, biogenic carbon storage), typical emission ranges and hotspots, methodological choices (functional unit, allocation), trade-offs and mitigation strategies (low-carbon cement, recycled steel, mass timber, design for longevity), and applying LCA results to material selection and policy recommendations.